The Oromo (Oromo: Oromoo) are an ethnic group found in Ethiopia, in northern Kenya, and to a lesser extent in parts of Somalia. With 30 million members, they constitute the single largest ethnic group in Ethiopia and approximately 34.49% of the population according to the 2007 census. Their native language is Oromo (also called Afaan Oromoo and Oromiffa), which is part of the Cushitic branch of the Afro-Asiatic language family.

The Oromo were formerly called Galla by non-Oromo Ethiopians, and one may encounter this name in older texts, but it is considered a pejorative term.